Electric storage device

Abstract

An electric storage device includes a storage module and a mounting plate. The storage module includes a plurality of storage cells stacked in a stacking direction and has an end surface in the stacking direction. The storage module is mounted on the mounting plate. The mounting plate includes a fastening part and a displacement absorbing part. The storage module is connected to the mounting plate at the fastening part. The displacement absorbing part absorbs displacement of the storage module in the stacking direction. The fastening part is provided between the displacement absorbing part and the end surface of the storage module in the stacking direction.

What is claimed is: 
     
       1. An electric storage device comprising:
 a storage module in which a plurality of storage cells are stacked in a stacking direction, the plurality of storage cells including a first storage cell and a second storage cell that is adjacent to the first storage cell in the stacking direction; and 
 a mounting plate connected to the storage module by being connected to a fastening part provided in the storage module, 
 wherein the mounting plate has a displacement absorbing part that has a longest dimension that extends in a cell side surface direction that is perpendicular to the stacking direction of the plurality of storage cells, the displacement absorbing part is configured to absorb displacement in the stacking direction by being deformed by a load in the stacking direction, 
 wherein the displacement absorbing part is provided on an inner side of the fastening part in the stacking direction, 
 wherein the storage module is connected to the mounting plate in a vertical direction, 
 wherein the longest dimension of the displacement absorbing part extends in a direction perpendicular to both of the vertical direction and the stacking direction, 
 wherein the mounting plate includes a fixing part that holds the storage module and is fixed to an attachment part, and 
 wherein the fixing part is provided on the inner side of the fastening part in the stacking direction, and the displacement absorbing part is disposed between the fixing part and the fastening part in the stacking direction. 
 
     
     
       2. The electric storage device according to  claim 1 , wherein the displacement absorbing part is a curved portion extending in the cell side surface direction, and has a wavy shape in a side view of the mounting plate from the cell side surface direction. 
     
     
       3. The electric storage device according to  claim 1 , wherein the displacement absorbing part includes:
 a projecting center portion projecting outward in the stacking direction at a center portion in the cell side surface direction; and 
 end portions separating inward in the stacking direction from the projecting center portion toward opposite sides in the cell side surface direction. 
 
     
     
       4. The electric storage device according to  claim 1 ,
 wherein the displacement absorbing part deforms in the stacking direction when the plurality of storage cells expand in the stacking direction. 
 
     
     
       5. The electric storage device according to  claim 1 ,
 wherein the displacement absorbing part deforms in the stacking direction such that a length of the mounting plate in the stacking direction increases. 
 
     
     
       6. The electric storage device according to  claim 1 ,
 wherein the displacement absorbing part allows and absorbs displacement in the stacking direction by being deformed by the load in the stacking direction. 
 
     
     
       7. The electric storage device according to  claim 1 , wherein each storage cell of the plurality of storage cells are elongated in the cell side surface direction. 
     
     
       8. The electric storage device according to  claim 1 , wherein the displacement absorbing part has a wavy shape when viewed in the cell side surface direction that is perpendicular to the stacking direction. 
     
     
       9. The electric storage device according to  claim 1 , wherein the displacement absorbing part is curved outward relative to a center of the storage module when viewed in a direction perpendicular to both the stacking direction and the cell side surface direction. 
     
     
       10. An electric storage device comprising:
 a storage module including a plurality of storage cells stacked in a stacking direction, the storage module having an end plate with an end surface in the stacking direction, the plurality of storage cells including a first storage cell and a second storage cell that is adjacent to the first storage cell in the stacking direction; and 
 a mounting plate on which the storage module is mounted, the mounting plate comprising:
 a fastening part at which the end plate of the storage module is connected to the mounting plate; and 
 a displacement absorbing part to absorb displacement of the storage module in the stacking direction, the fastening part being provided between the displacement absorbing part and the end surface of the end plate of the storage module in the stacking direction, wherein the storage module is connected to the mounting plate in a vertical direction, 
 
 wherein the displacement absorbing part extends in a direction perpendicular to both of the vertical direction and the stacking direction, 
 wherein the mounting plate includes a fixing part that holds the storage module and is fixed to an attachment part, and 
 wherein the fixing part is provided on an inner side of the mounting plate than the fastening part in the stacking direction, and the displacement absorbing part is disposed between the fixing part and the fastening part in the stacking direction. 
 
     
     
       11. The electric storage device according to  claim 10 , wherein the displacement absorbing part is a curved portion extending in a cell side surface direction perpendicular to the stacking direction, and has a wavy shape in a side view of the mounting plate from the cell side surface direction. 
     
     
       12. The electric storage device according to  claim 10 , wherein the displacement absorbing part includes:
 a projecting center portion projecting outward in the stacking direction at a center portion in a cell side surface direction perpendicular to the stacking direction; and 
 end portions separating inward in the stacking direction from the projecting center portion toward opposite sides in the cell side surface direction. 
 
     
     
       13. The electric storage device according to  claim 10 ,
 wherein the displacement absorbing part has a longest dimension that extends in a cell side surface direction perpendicular to the stacking direction. 
 
     
     
       14. The electric storage device according to  claim 10 ,
 wherein the displacement absorbing part deforms in the stacking direction when the plurality of storage cells expand in the stacking direction. 
 
     
     
       15. The electric storage device according to  claim 10 ,
 wherein the displacement absorbing part deforms in the stacking direction such that a length of the mounting plate in the stacking direction increases. 
 
     
     
       16. The electric storage device according to  claim 10 ,
 wherein the displacement absorbing part is spaced apart from the fastening part in the stacking direction. 
 
     
     
       17. An electric storage device comprising:
 a storage module including a plurality of storage cells stacked in a stacking direction, the storage module having a first end plate at a first end of the plurality of storage cells in the stacking direction and a second end plate at a second end of the plurality of storage cells in the stacking direction, the plurality of storage cells including a first storage cell and a second storage cell that is adjacent to the first storage cell in the stacking direction; and 
 a mounting plate on which the storage module is mounted, the mounting plate comprising:
 a first fastening part at which the first end plate of the storage module is connected to the mounting plate; 
 a second fastening part at which the second end plate of the storage module is connected to the mounting plate; and 
 a displacement absorbing part to absorb displacement of the storage module in the stacking direction, the displacement absorbing part being provided between the first fastening part and the second fastening part in the stacking direction, 
 
 wherein the storage module is connected to the mounting plate in a vertical direction, 
 wherein the displacement absorbing part extends in a direction perpendicular to both of the vertical direction and the stacking direction, 
 wherein the mounting plate includes a fixing part that holds the storage module and is fixed to an attachment part, and 
 wherein the fixing part is provided on an inner side of the first fastening part in the stacking direction, and the displacement absorbing part is disposed between the fixing part and the first fastening part in the stacking direction. 
 
     
     
       18. The electric storage device according to  claim 17 ,
 wherein the displacement absorbing part is spaced apart from the first fastening part and the second fastening part in the stacking direction.